I stayed here for three nights with my mother. The price was very reasonable and my concern was that it was too good to be true. It's a budget hotel but it is in no way uncomfortable or lacking in any way. The room was clean and warm (we stayed in winter in freezing temperatures), and the breakfast was good. The reception isn't staffed 24 hours a day but when they are there they are really helpful and friendly.
It is a 7/8 minute walk from the Neukölln U Bahn station.
Nice place, no price, zero complaints.